CN103867273A - Device and method for measuring distribution uniformity of reducing agent of diesel engine SCR system - Google Patents
Device and method for measuring distribution uniformity of reducing agent of diesel engine SCR system Download PDFInfo
- Publication number
- CN103867273A CN103867273A CN201410133968.1A CN201410133968A CN103867273A CN 103867273 A CN103867273 A CN 103867273A CN 201410133968 A CN201410133968 A CN 201410133968A CN 103867273 A CN103867273 A CN 103867273A
- Authority
- CN
- China
- Prior art keywords
- sampling pipe
- reducing agent
- scr system
- fitting seat
- catalyzer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a device and method for measuring the distribution uniformity of a reducing agent of a diesel engine SCR system. The concentration of the reducing agent at 17 uniform distribution measuring points on the cross section of a catalyst is measured through an experiment and a distribution uniformity index gamma of the reducing agent is obtained through calculation according to a measuring result. According to the device and method for measuring the distribution uniformity of the reducing agent of the diesel engine SCR system, operation is simple and convenient and measurement is accurate and reliable. According to the distribution uniformity index gamma, obtained through the method, of the reducing agent, the distribution uniformity of the reducing agent on the cross section of the catalyst of the SCR system can be accurately reflected.
Description
Technical field
The invention belongs to diesel engine nitrogen oxide (NOx) exhaust emission fields of measurement, be specifically related to diesel SCR (selective catalytic reduction) system reducing agent distributing homogeneity fields of measurement.
Background technique
Selective catalytic reduction (SCR) technology is one of technology of Reduction for Diesel Engines low NOx (NOx) discharge.SCR Technology Need sprays into appropriate aqueous solution of urea according to diesel exhaust gas state in exhaust, and after this aqueous solution of urea decomposites ammonia (NH in exhaust
3), the nitrogen oxide (NOx) in ammonia and exhaust is in catalyst surface generation redox reaction, final NH
3nOx is reduced to nitrogen (N
2).SCR technical requirements is as the NH of reducing agent
3be evenly distributed at catalytic converter cross section, but in practical application, following reason can cause NH as far as possible
3skewness, as poor in aqueous urea solution spray nozzle atomizing effect, aqueous solution of urea jet pressure compared with low, aqueous solution of urea emitted dose large, delivery temperature is lower, aqueous urea solution spray nozzle and catalyzer close together and mixer etc. is not installed.If NH
3skewness can cause the reduction of NOx transformation efficiency, NH
3leakage rate increases, thereby makes the deterioration of emission of diesel engine.To SCR system reducing agent distributing homogeneity, analysis mainly adopts computer simulation means to carry out simplation verification at present, lacks test data checking.And sampled measurements point is placed on SCR catalytic converter entrance section by existing SCR system reducing agent distributing homogeneity measuring device and method, because catalytic converter entrance section place exhaust air flow is unstable, in addition, in the time that front end is measured, sampling pipe can cause disturbance and affect flow field by flow, thereby causes larger measurement error.There is absorption and transformation owing to being coated in supported catalyst (SCR catalyzer to be measured), make measurement result inaccurate, the white carrier that utilization of the present invention and SCR catalytic-converter substrate to be measured have the uncoated catalyzer of same size, hole density and material replaces SCR catalytic converter to be measured, sampled point is placed on to white carrier outlet, thereby significantly reduce the measurement error causing because air motion is unstable, eliminate absorption and the transformation of catalyzer to NH3, it is more accurate to measure simultaneously.
Summary of the invention
Content of the present invention is a kind of SCR system of diesel engine reducing agent distributing homogeneity measuring device and method, by test, 17 reductant concentrations that are uniformly distributed measurement point on catalytic converter cross section are measured, and calculated the reducing agent exponent gamma that is evenly distributed according to measurement result.The object of this invention is to provide a kind of easy and simple to handle, measure SCR system of diesel engine reducing agent distributing homogeneity measuring device and method accurately and reliably.Utilize reducing agent that the method the obtains exponent gamma that is evenly distributed can accurately reflect reducing agent distributing homogeneity on catalytic converter cross section.
For reaching above object, technological scheme of the present invention is as follows:
A kind of SCR system of diesel engine reducing agent distributing homogeneity measuring device, comprises suction tude 1, white carrier package shell 2, the white carrier 3 of catalyzer, sampling pipe 4, sampling pipe fitting seat 8, air outlet capsule 9;
The white carrier 3 of catalyzer is encapsulated in white carrier package shell 2, and ensures the two end face at grade; Sampling pipe fitting seat 8 is connected by flange with white carrier package shell 2;
Measuring device size, shape and pipeline layout are identical with SCR system to be measured; The white carrier dimensions of catalyzer, hole density and material in measuring device is identical with SCR system catalytic converter used carrier to be measured;
On sampling pipe fitting seat 8, have the thieff hatch of 4 different-diameter directions, and in four thieff hatchs, any two neighbouring sample holes are circumferentially separated by 45 °, when measurement, sampling pipe 4 is inserted in each thieff hatch successively, changes measuring point position by changing sampling pipe in the degree of depth of each thieff hatch insertion;
Suction tude 1 is positioned at white carrier 3 entrance sections of catalyzer, and sampling pipe fitting seat 8 is arranged on the white carrier of catalyzer 3 rear ends, and sample is in the white carrier of catalyzer 3 outlets.
Further, in the time carrying out sampled measurements by a certain thieff hatch A, its excess-three thieff hatch passes through bolt seal; Sampling pipe 4 is marked with 5 equidistant marks, and the degree of depth of 5 marks change sampling pipes insertion thieff hatch A that according to sampling pipe subscript can be to sampling along thieff hatch A diametric(al) uniform 5 measuring point A1, A2, A3, A4 and A5.
Further, in the time that the diameter of the white carrier 3 of catalyzer is R, between every two adjacent markers, at a distance of 0.45R, 5 mark positions should ensure that sampling pipe inserts after thieff hatch, in the time that the 3rd mark is positioned at thieff hatch end face, the sampling end of sampling pipe 4 is just in time positioned at the center of circle of sampling pipe fitting seat 8.
Further, between sampling pipe fitting seat 8 and white carrier package shell 2, be filled with asbestos packing 6; Sampling pipe 4 is fixed with assurance device and is sealed by nut with sampling pipe fitting seat 8; Air outlet capsule 9 utilizes clamping bolt 5 and tightening nut 7 to fix with sampling pipe fitting seat 8; Between this external air outlet capsule 9 and sampling pipe fitting seat 8, be filled with asbestos packing 6.
Further, 17 reductant concentrations that are uniformly distributed measuring point on the white carrier outlet of catalyzer cross section are measured, obtained the concentration of reducing agent in each measuring point exhaust, and then calculate reducing agent distributing homogeneity exponent gamma.
Further, the sampling end of sampling pipe 4 is 45 degree scarves, and scarf is aimed at exhaust and carried out flow path direction to exhaust is sampled.
A kind of SCR system of diesel engine reducing agent distributing homogeneity method of measurement, the white carrier 3 of catalyzer is encapsulated in white carrier package shell 2, and ensures the two end face at grade; Sampling pipe fitting seat 8 is connected by flange with white carrier package shell 2;
Measuring device size, shape and pipeline layout are identical with SCR system to be measured; White carrier dimensions, hole density and material in measuring device are identical with SCR system catalyst to be measured;
Suction tude 1 is positioned at white carrier 3 entrance sections of catalyzer, and sampling pipe fitting seat 8 is arranged on the white carrier of catalyzer 3 rear ends, and sample is in the white carrier of catalyzer 3 outlets.
On sampling pipe fitting seat 8, have 4 thieff hatchs along different-diameter direction, when measurement, sampling pipe 4 is inserted in each thieff hatch successively; In the time carrying out sampled measurements by a certain thieff hatch A, its excess-three thieff hatch passes through bolt seal; Sampling pipe 4 is marked with 5 equidistant marks, and the degree of depth of 5 marks change sampling pipes insertion thieff hatch A that according to sampling pipe subscript can be to sampling along thieff hatch A diametric(al) uniform 5 measuring point A1, A2, A3, A4 and A5;
Utilize above-mentioned steps respectively thieff hatch A, B, C, D to be carried out to sampled measurements, can obtain the reductant concentration of each measuring point, the exponent gamma thereby calculating reducing agent is evenly distributed.
Further, adopt the reducing agent exponent gamma that is evenly distributed to evaluate reducing agent distributing homogeneity, γ is defined as follows:
Wherein, c
ibe i the reducing agent volume concentration on measuring point, n is measuring point sum,
all c
imean value.
Further, the sampling end of sampling pipe 4 is 45 degree scarves, and scarf is aimed at exhaust and carried out flow path direction to exhaust is sampled, and the other end of sampling pipe 4 is connected with exhaust gas analyzer, thereby the reductant concentration of measurement point is carried out to sampled measurements.
Further, in the time measuring SCR system reducing agent distributing homogeneity, the NH3 concentration that each sampled point is recorded and HNCO concentration sum are considered as the concentration of reducing agent.
In used urea SCR system, exhaust gas analyzer need to be to the NH of measurement point
3measure with the concentration of HNCO.This is that while operation because of real engine, 1 mole of HNCO also can further resolve into 1 mole of NH
3, the NH that therefore in the present invention, handle records
3concentration and HNCO concentration sum are considered as the concentration of reducing agent.The present invention is to 17 NH that are uniformly distributed measuring point on catalytic converter cross section
3with HNCO (isocyanic acid) concentration measures, obtain the concentration of reducing agent in each measurement point exhaust.SCR technical requirements reducing agent can be evenly distributed at catalytic converter entrance section as far as possible.But because catalytic converter entrance section place exhaust air flow is unstable, in addition, in the time that front end is measured, sampling pipe can make exhaust air flow produce disturbance, thereby causes larger measurement error.And catalytic converter outlet port air-flow is relatively stable, therefore sampled measurements point of the present invention is selected on catalytic converter outlet cross section.But NH when actual measurement in exhaust
3can be adsorbed on catalyst surface, and react with the NOx in exhaust, make the NH measuring at catalytic converter outlet cross section
3concentration and catalytic converter ingress are not inconsistent, therefore in order to eliminate catalyzer to NH
3absorption and transformation, the present invention replaces actual catalytic converter (catalyzer+white carrier) with the white carrier of the uncoated catalyzer of same size.SCR catalyzer plays catalysis in SCR reaction, is divided into noble metal catalyst, metal oxide catalyst, molecular sieve catalyst and carbon-supported catalysts according to composition difference.Catalyzer is generally coated on porous carrier, thereby makes the area of contact of catalyzer and exhaust larger.Catalyst carrier is divided into again cordierite carrier and metallic carrier etc. according to material difference.White carrier in the present invention refers to the carrier that there is no coated catalysts, and in actual measurement, reducing agent and NOx can't be in white carrier surface generation catalytic reactions.Because each passage of the white carrier of catalyzer is not connected, the NH therefore measuring at white carrier outlet place
3distribution can the white carrier inlet of accurate response cross section NH
3distribution situation.
The present invention utilizes the reducing agent exponent gamma that is evenly distributed to evaluate reducing agent distributing homogeneity, and γ is defined as follows:
Wherein, c
ibe i the reducing agent volume concentration on measuring point, n is measuring point sum,
all c
imean value.This formula can be by value the reflection of the exponent gamma between 0～1 reducing agent degree that is evenly distributed.
Brief description of the drawings
Fig. 1 is reducing agent distributing homogeneity measuring device schematic diagram.
Fig. 2 is white carrier outlet cross section measurement point distribution schematic diagram.
Fig. 3 a is sampling pipe fitting seat plan structure figure.
Fig. 3 b is that sampling pipe fitting seat is faced structural drawing
Fig. 4 reductant concentration when mixer is not installed distributes
Fig. 5 is that when mixer is installed, reductant concentration distributes
Embodiment
Below in conjunction with accompanying drawing to structure of the present invention, principle, working procedure and and embodiment be further described.
1-suction tude, the white carrier package shell of 2-, the white carrier of 3-catalyzer, 4-sampling pipe, 5-clamping bolt, 6-asbestos packing 7-tightening nut, 8-sampling pipe fitting seat, 9-air outlet capsule, 10-steam outlet pipe.
Referring to accompanying drawing 1, a kind of SCR system of diesel engine reducing agent of the present invention distributing homogeneity measuring device is mainly made up of suction tude 1, white carrier package shell 2, the white carrier 3 of catalyzer, sampling pipe 4, clamping bolt 5, asbestos packing 6, tightening nut 7, sampling pipe fitting seat 8, air outlet capsule 9, steam outlet pipe 10.In measuring device, the white carrier 3 of catalyzer is encapsulated in white carrier package shell 2, and ensures the two end face at grade.Sampling pipe fitting seat 8 is arranged on the white carrier of catalyzer 3 rear ends, is connected, and utilizes clamping bolt 5 and tightening nut 7 to fix with white carrier package shell 2 by flange.Between this external sampling pipe fitting seat 8 and white carrier package shell 2, be filled with asbestos packing 6, thus assurance device sealing.Sampling pipe 4 is arranged in the thieff hatch of sampling pipe fitting seat 8, and is fixed with assurance device and sealed by nut.Because sampling pipe fitting seat 8 is arranged on the white carrier of catalyzer 3 rear ends, thereby can sample to the exhaust at the white carrier of catalyzer 3 outlet places by the sampling pipe 4 being arranged on sampling pipe fitting seat 8.Air outlet capsule 9 is connected by flange with sampling pipe fitting seat 8, and utilizes clamping bolt 5 and tightening nut 7 to fix.Between this external air outlet capsule 9 and sampling pipe fitting seat 8, be filled with asbestos packing 6, thereby ensure measuring device sealing.The measuring device size, shape and the pipeline layout that are made up of suction tude 1, white carrier package shell 2, clamping bolt 5, asbestos packing 6, tightening nut 7, sampling pipe fitting seat 8, air outlet capsule 9, steam outlet pipe 10 should be identical with SCR system to be measured.White carrier 3 sizes of catalyzer in simultaneous measuring apparatus should be identical with SCR system catalytic converter used carrier to be measured with hole density and material, so just can ensure that measuring device is identical with the intrasystem flow field of SCR to be measured, thereby utilize the reductant concentration distribution of measuring device measurement of the present invention can truly reflect the reducing agent distribution situation of SCR system to be measured.
The distribution of 17 measuring points as shown in Figure 2.In order to reflect the uniformity of reducing agent in whole cross-sectional distribution, measuring point should cover whole cross section as far as possible, 17 measuring points shown in Fig. 2 are arranged measurement point distribution are being measured on 4 diameters circumferential uniform on cross section, on every diameter, be evenly equipped with 5 measuring points, in the time that the internal diameter of the white carrier 3 of catalyzer is R, on same diameter, adjacent measuring point spacing is 0.45R.17 measuring points thus arranged utilize less measurement number of times fully to reflect the distribution character of reducing agent in whole cross section.
On sampling pipe fitting seat 8, have 4 thieff hatchs along different-diameter direction (thieff hatch A, B, C, D, as accompanying drawing 3a, Fig. 3 b), 4 thieff hatchs circumferentially distribute, the circumferential angle in neighbouring sample hole is 45 °.When measurement, sampling pipe 4 is inserted in each thieff hatch successively, for example thieff hatch A.In the time carrying out sampled measurements by a certain thieff hatch, its excess-three thieff hatch passes through bolt seal.Sampling pipe 4 is marked with 5 equidistant marks, between every two adjacent markers at a distance of 0.45R.5 mark positions should ensure that sampling pipe inserts after thieff hatch, and in the time that the 3rd mark is positioned at thieff hatch end face, the sampling end of sampling pipe is just in time positioned at the center of circle of sampling pipe fitting seat 8.Can be easy to control State selective measurements point according to mark like this, ensure that the measuring point of selecting is evenly distributed on cross section.The degree of depth of 5 marks change sampling pipes insertion thieff hatch A that according to sampling pipe subscript can be to sampling along thieff hatch A diametric(al) uniform 5 measuring point A1, A2, A3, A4 and A5.Utilize said method to carry out sampled measurements by thieff hatch A, B, C, D respectively, thereby can obtain the reductant concentration of 17 measuring points in accompanying drawing 2.The sampling end of sampling pipe 4 is 45 degree scarves, and scarf is aimed at exhaust and carried out flow path direction to exhaust is sampled.Sampling pipe 4 the other ends are connected with exhaust gas analyzer, thereby the reductant concentration of this measurement point is carried out to sampled measurements.
The degree of depth of inserting thieff hatch by changing thieff hatch position and sampling pipe, completes the reductant concentration of white carrier 3 equally distributed 17 measuring points in outlet place of catalyzer is measured.According to each measuring point reductant concentration value recording, can calculate the reducing agent exponent gamma that is evenly distributed by following formula.
In formula, c
ibe i the reducing agent volume concentration on measuring point, n is measuring point sum,
all c
imean value.
Utilize testing apparatus and the method for foregoing invention, on engine pedestal, 4 cylinder 4.5L SCR system of diesel engine reducing agent distributing homogeneities carried out to experimental measurement, contrasted have, reducing agent distributing homogeneity during without reducing agent mixer.When measurement, ensure that by rotating speed and the load of adjusting motor delivery temperature is 300 DEG C, extraction flow is 300kg/h.After engine operating condition and exhaust situation are stable, each measuring point exhaust is carried out to sampled measurements, sampling is stablized after 1 minute emissions data is recorded to 30 seconds, then averages as the concentration value of this place measuring point.Record by said method have, reductant concentration distributed data is as shown in table 1 during without reducing agent mixer.
Table 1 reductant concentration distribution measuring results
According to the test data of table 1, while obtaining having or not mixer, the reductant concentration distribution situation of 17 measuring points is as shown in accompanying drawing 4 and accompanying drawing 5.Can be found out by accompanying drawing 4 and accompanying drawing 5, while mixer not being installed, the reductant concentration distributional difference of 17 measuring points is larger, and after installation mixer, the reductant concentration distribution of 17 measuring points becomes more even.According to the reducing agent formula of exponent gamma reducing agent exponent gamma=0.810 that is evenly distributed while mixer not being installed that is evenly distributed, reducing agent exponent gamma=0.954 that is evenly distributed is installed after mixer by the data of table 1.Test result explanation adopts this kind to measure the reducing agent distributing homogeneity that evaluating method can reasonable quantitative assessment contrast SCR system.
For a certain SCR system, utilize the inventive method to record its reducing agent and be evenly distributed after exponent gamma and can carry out accurate evaluation to its reducing agent distributing homogeneity, and then can determine whether and need to further be optimized to improve reducing agent distributing homogeneity to SCR systematic parameter.If the SCR system reducing agent recording is evenly distributed, exponent gamma is lower, need by system structure parameter optimization, the means such as mixer, raising injection of reducing agent injection pressure of installing are improved to reducing agent distributing homogeneity, until the reducing agent recording is evenly distributed, exponent gamma reaches designing requirement.
Above mode of execution does not form the restriction to claim protection domain, conceives same or analogous mode of execution all among protection scope of the present invention with the present invention.
Claims (10)
1. a SCR system of diesel engine reducing agent distributing homogeneity measuring device, is characterized in that:
Comprise suction tude (1), white carrier package shell (2), the white carrier of catalyzer (3), sampling pipe (4), sampling pipe fitting seat (8), air outlet capsule (9);
The white carrier of catalyzer (3) is encapsulated in white carrier package shell (2), and ensures the two end face at grade; Sampling pipe fitting seat (8) is connected by flange with white carrier package shell (2);
Sampling pipe (4) is arranged in the thieff hatch of sampling pipe fitting seat (8);
Air outlet capsule (9) is connected by flange with sampling pipe fitting seat (8);
Measuring device size, shape and pipeline layout are identical with SCR system to be measured; The white carrier dimensions of catalyzer, hole density and material in measuring device is identical with SCR system catalytic converter used carrier to be measured;
On sampling pipe fitting seat (8), have the thieff hatch of 4 different-diameter directions, and in four thieff hatchs, any two neighbouring sample holes are circumferentially separated by 45 °, sampling pipe when measurement (4) is inserted in each thieff hatch successively, changes measuring point position by changing sampling pipe in the degree of depth of each thieff hatch insertion;
Suction tude (1) is positioned at the white carrier of catalyzer (3) entrance section, and sampling pipe fitting seat (8) is arranged on the white carrier of catalyzer (3) rear end, and sample is in the white carrier of catalyzer (3) outlet.
2. a SCR system of diesel engine reducing agent distributing homogeneity measuring device as claimed in claim 1, is characterized in that: in the time carrying out sampled measurements by a certain thieff hatch A, its excess-three thieff hatch passes through bolt seal; Sampling pipe (4) is marked with 5 equidistant marks, and the degree of depth of 5 marks change sampling pipes insertion thieff hatch A that according to sampling pipe subscript can be to sampling along thieff hatch A diametric(al) uniform 5 measuring point A1, A2, A3, A4 and A5.
3. a SCR system of diesel engine reducing agent distributing homogeneity measuring device as claimed in claim 2, it is characterized in that: in the time that the diameter of the white carrier of catalyzer (3) is R, between every two adjacent markers at a distance of 0.45R, 5 mark positions should ensure that sampling pipe inserts after thieff hatch, in the time that the 3rd mark is positioned at thieff hatch end face, the sampling end of sampling pipe (4) is just in time positioned at the center of circle of sampling pipe fitting seat (8).
4. the SCR system of diesel engine reducing agent distributing homogeneity measuring device as described in aforementioned arbitrary claim, is characterized in that: between sampling pipe fitting seat (8) and white carrier package shell (2), be filled with asbestos packing (6); Sampling pipe (4) is fixed with assurance device and is sealed by nut with sampling pipe fitting seat (8); Air outlet capsule (9) utilizes clamping bolt (5) and tightening nut (7) to fix with sampling pipe fitting seat (8); Between this external air outlet capsule (9) and sampling pipe fitting seat (8), be filled with asbestos packing (6).
5. the SCR system of diesel engine reducing agent distributing homogeneity measuring device as described in aforementioned arbitrary claim, it is characterized in that: 17 reductant concentrations that are uniformly distributed measuring point on the white carrier outlet of catalyzer cross section are measured, obtain the concentration of reducing agent in each measuring point exhaust, and then calculate reducing agent distributing homogeneity exponent gamma.
6. the SCR system of diesel engine reducing agent distributing homogeneity measuring device as described in aforementioned arbitrary claim, it is characterized in that: the sampling end of sampling pipe (4) is 45 degree scarves, scarf is aimed at exhaust and is carried out flow path direction to exhaust is sampled.
7. a SCR system of diesel engine reducing agent distributing homogeneity method of measurement, is characterized in that:
White catalyzer carrier (3) is encapsulated in white carrier package shell (2), and ensures the two end face at grade; Sampling pipe fitting seat (8) is connected by flange with white carrier package shell (2);
Sampling pipe (4) is arranged in the thieff hatch of sampling pipe fitting seat (8);
Air outlet capsule (9) is connected by flange with sampling pipe fitting seat (8);
Measuring device size, shape and pipeline layout are identical with SCR system to be measured; The white carrier dimensions of catalyzer, hole density and material in measuring device is identical with SCR system catalytic converter used carrier to be measured;
Suction tude (1) is arranged in to the white carrier of catalyzer (3) entrance section, sampling pipe fitting seat (8) is arranged on the white carrier of catalyzer (3) rear end, and sampled point is located at the white carrier of catalyzer (3) outlet;
On sampling pipe fitting seat (8), have 4 thieff hatchs along different-diameter direction, sampling pipe when measurement (4) is inserted in each thieff hatch successively; In the time carrying out sampled measurements by a thieff hatch A, its excess-three thieff hatch passes through bolt seal; Sampling pipe 4 is marked with 5 equidistant marks, and the degree of depth of 5 marks change sampling pipes insertion thieff hatch A that according to sampling pipe subscript can be to sampling along thieff hatch A diametric(al) uniform 5 measuring point A1, A2, A3, A4 and A5;
Utilize above-mentioned steps respectively thieff hatch A, B, C, D to be carried out to sampled measurements, can obtain the reductant concentration of each each and every one measuring point, the exponent gamma thereby calculating reducing agent is evenly distributed.
8. a SCR system of diesel engine reducing agent distributing homogeneity method of measurement as claimed in claim 7, is characterized in that: adopt the reducing agent exponent gamma that is evenly distributed to evaluate reducing agent distributing homogeneity, γ is defined as follows:
Wherein, c
ibe i the reducing agent volume concentration on measuring point, n is measuring point sum,
all c
imean value.
9. a SCR system of diesel engine reducing agent distributing homogeneity method of measurement as claimed in claim 7, it is characterized in that: the sampling end of sampling pipe (4) is 45 degree scarves, scarf is aimed at exhaust and is carried out flow path direction to exhaust is sampled, the other end of sampling pipe (4) is connected with exhaust gas analyzer, thereby the reductant concentration of measurement point is carried out to sampled measurements.
10. the SCR system of diesel engine reducing agent distributing homogeneity method of measurement as described in above-mentioned arbitrary claim, is characterized in that: in the time measuring SCR system reducing agent distributing homogeneity, and the NH that each sampled point is recorded
3concentration and HNCO concentration sum are considered as the concentration of reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410133968.1A CN103867273A (en) | 2014-04-04 | 2014-04-04 | Device and method for measuring distribution uniformity of reducing agent of diesel engine SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410133968.1A CN103867273A (en) | 2014-04-04 | 2014-04-04 | Device and method for measuring distribution uniformity of reducing agent of diesel engine SCR system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103867273A true CN103867273A (en) | 2014-06-18 |
Family
ID=50906218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410133968.1A Pending CN103867273A (en) | 2014-04-04 | 2014-04-04 | Device and method for measuring distribution uniformity of reducing agent of diesel engine SCR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103867273A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252929A (en) * | 2018-11-16 | 2019-01-22 | 上海歌地催化剂有限公司 | For testing the aided-detection device and its test method of ammonia uniformity |
| CN109884256A (en) * | 2019-03-27 | 2019-06-14 | 河南科技大学 | SCR catalyst container multi-section measuring system |
| CN110426249A (en) * | 2019-08-06 | 2019-11-08 | 无锡威孚力达催化净化器有限责任公司 | The test macro and method of Multi probe sampling apparatus, ammonia mixture homogeneity |
| WO2021139214A1 (en) * | 2020-01-10 | 2021-07-15 | 天纳克（苏州）排放系统有限公司 | Ammonia gas concentration uniformity test method for gas exhaust aftertreatment system |
| CN113818949A (en) * | 2021-10-26 | 2021-12-21 | 无锡威孚力达催化净化器有限责任公司 | Method for testing concentration of NOx in automobile exhaust, mixing device and aftertreatment system |
| CN114542247A (en) * | 2022-01-18 | 2022-05-27 | 潍柴动力股份有限公司 | SCR system and engine |
| CN109252929B (en) * | 2018-11-16 | 2024-06-07 | 上海歌地催化剂有限公司 | Auxiliary detection equipment for testing ammonia uniformity and testing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1777477A (en) * | 2002-12-27 | 2006-05-24 | 中国电力株式会社 | Honeycomb catalyst, nox removal catalyst of nox removal apparatus, and flue gas nox removal apparatus |
| CN102588058A (en) * | 2012-02-21 | 2012-07-18 | 西华大学 | Testing system for post-processing device of engine |
| WO2013165296A1 (en) * | 2012-05-04 | 2013-11-07 | Scania Cv Ab | Apparatus for measuring of contents in exhaust gases |
-
2014
- 2014-04-04 CN CN201410133968.1A patent/CN103867273A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1777477A (en) * | 2002-12-27 | 2006-05-24 | 中国电力株式会社 | Honeycomb catalyst, nox removal catalyst of nox removal apparatus, and flue gas nox removal apparatus |
| CN102588058A (en) * | 2012-02-21 | 2012-07-18 | 西华大学 | Testing system for post-processing device of engine |
| WO2013165296A1 (en) * | 2012-05-04 | 2013-11-07 | Scania Cv Ab | Apparatus for measuring of contents in exhaust gases |
Non-Patent Citations (2)
| Title |
|---|
| 赵彦光等: "混合器对车用柴油机尿素SCR系统性能影响的试验研究", 《汽车工程》, vol. 33, no. 4, 30 April 2011 (2011-04-30) * |
| 陈镇等: "柴油机尿素SCR氨分布均匀性的试验与模拟优化", 《车用发动机》, no. 1, 29 February 2012 (2012-02-29) * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252929A (en) * | 2018-11-16 | 2019-01-22 | 上海歌地催化剂有限公司 | For testing the aided-detection device and its test method of ammonia uniformity |
| CN109252929B (en) * | 2018-11-16 | 2024-06-07 | 上海歌地催化剂有限公司 | Auxiliary detection equipment for testing ammonia uniformity and testing method thereof |
| CN109884256A (en) * | 2019-03-27 | 2019-06-14 | 河南科技大学 | SCR catalyst container multi-section measuring system |
| CN110426249A (en) * | 2019-08-06 | 2019-11-08 | 无锡威孚力达催化净化器有限责任公司 | The test macro and method of Multi probe sampling apparatus, ammonia mixture homogeneity |
| CN110426249B (en) * | 2019-08-06 | 2022-05-20 | 无锡威孚力达催化净化器有限责任公司 | Multi-probe sampling device, and ammonia gas mixing uniformity testing system and method |
| WO2021139214A1 (en) * | 2020-01-10 | 2021-07-15 | 天纳克（苏州）排放系统有限公司 | Ammonia gas concentration uniformity test method for gas exhaust aftertreatment system |
| CN113818949A (en) * | 2021-10-26 | 2021-12-21 | 无锡威孚力达催化净化器有限责任公司 | Method for testing concentration of NOx in automobile exhaust, mixing device and aftertreatment system |
| CN114542247A (en) * | 2022-01-18 | 2022-05-27 | 潍柴动力股份有限公司 | SCR system and engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10883971B2 (en) | Uniformity index performance evaluation in an SCR aftertreatment system | |
| CN103867273A (en) | Device and method for measuring distribution uniformity of reducing agent of diesel engine SCR system | |
| CN104234802B (en) | SCR (Selective Catalytic Reduction) catalyst aging judgment method based on NOx feedback and ammonia storage prediction | |
| US8966965B2 (en) | Selective catalytic reduction outlet mixing device | |
| KR20150015494A (en) | Apparatus for measuring of contents in exhaust gases | |
| CN101949317B (en) | Identifying ammonia non-slip conditions in a selective catlytic reduction application | |
| US9347356B2 (en) | Exhaust gas processing system independent to engine controls | |
| BR112012022796B1 (en) | control system for dosing compensation in a scr system | |
| CN108087065B (en) | SCR catalyst ammonia density modification method and SCR processing system | |
| US20220170406A1 (en) | System and methods for controlling flow distribution in an aftertreatment system | |
| WO2021022841A1 (en) | Multi-probe sampling device, and system and method for testing mixture homogeneity of ammonia gas | |
| WO2021057444A1 (en) | Method for quickly calibrating scr ammonia ratio factor of diesel engine | |
| CN109404108A (en) | One kind being used for diesel engine NOxThe calculation method and device of discharge value | |
| CN112100933A (en) | Ammonia spraying simulation optimization method, system and device for SCR system and storage medium | |
| CN102590537A (en) | System for evaluating catalyst and material | |
| WO2016039720A1 (en) | Exhaust gas mixer device | |
| CN104405481A (en) | Method for calibrating urea spray dose | |
| CN110017202B (en) | Urea collector, urea uniformity detection system and method for detecting urea uniformity | |
| WO2021139214A1 (en) | Ammonia gas concentration uniformity test method for gas exhaust aftertreatment system | |
| Ottaviani et al. | Dual Line Exhaust Design Optimisation to Maximize SCR Catalyst Efficiency thru Improved Ammonia Distribution | |
| CN105443216A (en) | Vehicle catalyst oxygen storage capacity testing system | |
| Moos et al. | Automotive catalyst state diagnosis using microwaves | |
| CN206740714U (en) | A kind of SCR denitration system catalyst activity on-line measuring device | |
| CN205091291U (en) | Flue gas denitration catalyst performance detection device | |
| CN215761870U (en) | Novel blade type flow guide device for SCR air outlet end |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 100083, C, block 128, Dongsheng building, No. 8 East Zhongguancun Road, Beijing, Haidian District Applicant after: BEIJING KELING POWER TECHNOLOGY CO., LTD. Address before: 100083, building 1, building 18, Zhongguancun East Road, Beijing, Haidian District, C-1808-23 Applicant before: BEIJING KELING POWER TECHNOLOGY CO., LTD. |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140618 |